A novelty compact fiber Bragg grating accelerometer based on the flexible spring

To meet the increasingly miniaturized and precise monitoring demands, this paper proposed a compact Fiber Bragg Grating (FBG) accelerometer based on a flexible spring. The designed FBG accelerometer retains the compact structure and good lateral anti-interference capability observed in diaphragm type FBG accelerometers, while significantly enhancing the sensitivity. Firstly, the 3D model and the dynamic model of the accelerometer was designed and constructed. Subsequently, theoretical values for accelerometer sensitivity and resonant frequency were derived. Then, finite element modeling (FEM) was employed to investigate the measurement performance of the accelerometer. Finally, a vibration calibration platform was established to determine the actual operational performance of the accelerometer through a series of acceleration excitation and frequency sweep experiments.